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Measurement Design Examples

Measurement Design Examples

Introduction

The CDMA2K_Measurement_prj project shows examples for measuring forward and reverse link transmission as well as peak to average power performance of HPSK and QPSK. The following sections describe the designs and provide schematics and simulation results.

Forward Link SR1 Transmission Measurements

DsnCDMA2K_FwdSR1Trans.dsn

Features

Forward QPSK modulation Walsh modulator and Walsh rotation De-QPSK structure

Demodulation and derotation 48-order baseband filter 1.2288 Mcps chip rate Non-linear RF amplifier

Eye diagram and constellation display during simulation EVM and ACPR measurements

Description

is an example design for measuring forward link SR1 transmissions. QPSK, Walsh modulator, Walsh rotator, baseband

DsnCDMA2K_FwdSR1Trans.dsn

filter and non-linear RF amplifier are applied.

After De-QPSK, demodulation and derotation, the I way Eye diagram and received signal constellation are shown in real time.When the amplitude of white noise is adjusted, the eye diagram opening and constellation scattering changes can be viewed.

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1. 2.

DsnCDMA2K_FwdSR1Trans.dsn

Notes

Channel coding and Rake receiver are not shown in this example.

During simulation, the Control Panel is displayed to allow noise magnitude adjustment. For EVM measurement, noise magnitude must remain constant before the Data collection is complete message is displayed.

Simulation Results

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Eye Diagram (Noise Magnitude = 5.3)

Constellation of Demodulated Signals (Noise Magnitude = 0)

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The following figure shows spectrum, ACPR and EVM values. Noise magnitude equals 0.5. The graph is saved in FwdSR1Trans.dds; corresponding data is saved in FwdSR1Trans.ds.

ACPR and EVM Performance

The following table shows EVM values based on different noise values.

EVM Values

EVM Noise Magnitude Value

0.017 0 0.030 0.5 0.055 1 0.083 1.5

Benchmark

Hardware platform: Pentium II 400 MHz, 256 MB memory Software platform: Windows NT 4.0 workstation, ADS 1.3 Data points: data of 5 msec

Simulation time: 73 seconds

Forward Link SR3 Transmission Measurements

CDMA2K_Measurement_prj Design Name

DsnCDMA2K_FwdSR3Trans.dsn

Features

Forward QPSK modulation Walsh modulator and Walsh rotator De-QPSK structure

Demodulation and derotation 108-order baseband filter 3.6864 Mcps chip rate Non-linear RF amplifier

Eye diagram and constellation display during simulation EVM and ACPR measurements

(5)

1. 2.

Description

is an example design for measuring forward link SR3 transmissions. QPSK, Walsh modulator, Walsh rotator, baseband

DsnCDMA2K_FwdSR3Trans.dsn

filter and non-linear RF amplifier are applied.

After De-QPSK, demodulation and derotation, the I way Eye diagram and received signal constellation are shown in real time. When the amplitude of white noise is adjusted, the eye diagram opening and constellation scattering changes can be viewed.

Schematic

The schematic for this design is shown in the following figure.

DsnCDMA2K_FwdSR3Trans.dsn

Notes

Channel coding and Rake receiver are not shown in this example.

During simulation, the Control Panel is displayed to allow noise magnitude adjustment. For EVM measurement, noise magnitude must remain constant the Data collection is complete message is displayed.

(6)

Eye Diagram (Noise Magnitude = 0)

Eye Diagram (Noise Magnitude = 4.5)

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Constellation of Demodulated Signals (Noise Magnitude =4.5)

The following figure shows the ACPR and EVM performance spectrum with a noise magnitude of 0. The graph is saved in FwdSR3Trans.dds; corresponding data is saved in FwdSR3Trans.ds.

ACPR and EVM Performance

The following table shows EVM values based on different noise values.

EVM Values

EVM Noise Magnitude Value

0.011 0 0.021 0.5 0.037 1 0.055 1.5

Benchmark

Hardware platform: Pentium II 400 MHz, 256 MB memory Software platform: Windows NT 4.0 workstation, ADS 1.3 Data points: data of 2 msec

(8)

Reverse SR1 Transmission (HPSK) Measurements

CDMA2K_Measurement_prj Design Name

DsnCDMA2K_RevSR1Hpsk.dsn

Features

Multi-code channel (HPSK channel) HPSK modulation and demodulation 48-order baseband filter

1.2288 Mcps chip rate Non-linear RF amplifier

Eye diagram and constellation display during simulation EVM, ACPR, and CCDF measurements

Description

is an example design for measuring reverse link SR1 transmissions. HPSK, baseband filter, and non-linear RF amplifier are

DsnCDMA2K_RevSR1Hpsk.dsn

applied.

After HPSK demodulation, the I way Eye diagram and received signal constellation are displayed during simulation. White noise amplitude can be adjusted while observing the Eye diagram and constellation scattering.

In this example the Traffic Fundamental Channel signal with Walsh Code Index 5 are measured. For this code channel, the modulator method is HPSK. After demodulation, the constellation of this code channel is same as BPSK. So in EVM measurement and constellation showing, BPSK mode is referred as standard modulation type.

Schematics

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1. 2. 3.

HPSK Channel

Notes

Channel coding and Rake receiver are not shown in this example.

In HPSK Channel subnetwork, various code channels are used. The Pilot Channel is constant logic 0, which equals NRZ 1. The output power of other code channels can be adjusted by Gain model. Here the fundamental channel uses Walsh Code index 5.

During simulation, the Control Panel is displayed to allow noise magnitude adjustment. For EVM measurement, noise magnitude must remain constant before the Data collection is complete message is displayed.

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Transmission Constellation

Eye diagram (Noise Magnitude = 0)

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Constellation of Demodulated Signals (Noise Magnitude = 0)

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The following figure shows the ACPR and EVM performance spectrum with a noise magnitude of 0. The graph is saved in RevSR1HPSK.dds; corresponding data is saved in RevSR1HPSK.ds.

ACPR and EVM Performance

The following table shows EVM values based on different noise values.

EVM Values

EVM Noise Magnitude Value

0.060 0 0.069 0.5 0.103 1

(13)

CCDF Performance

Benchmark

Hardware platform: Pentium II 400 MHz, 256 MB memory Software platform: Windows NT 4.0 workstation, ADS 1.3 Data points: data of 5 msec

Simulation time: 193 seconds

Reverse SR3 Transmission (HPSK) Measurements

CDMA2K_Measurement_prj Design Name

DsnCDMA2K_RevSR3Hpsk.dsn

Features

Multi-code channel (HPSK channel) HPSK modulation and demodulation 108-order baseband filter

3.6864 Mcps chip rate Non-linear RF amplifier

Eye diagram and constellation display during simulation EVM, ACPR and CCDF measurements

Description

is an example design for measuring reverse link SR3 transmissions. HPSK, baseband filter and non-linear RF amplifier are

DsnCDMA2K_RevSR3Hpsk.dsn

applied.

After HPSK demodulation, I way Eye diagram and received signal constellation are displayed during simulation. White noise amplitude can be adjusted while observing the Eye diagram and constellation scattering.

(14)

In this example the Traffic Fundamental Channel signal with Walsh Code Index 5 are measured. For this code channel, the modulator method is HPSK. After demodulation, the constellation of this code channel is same as BPSK. So in EVM measurement and constellation showing, BPSK mode is referred as standard modulation type.

Schematic

DsnCDMA2K_RevSR3Hpsk.dsn

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1. 2.

3.

Notes

Channel coding and Rake receiver are not shown in this example.

In HPSK Channel subnetwork, various code channels are used. The pilot channel is constant logic 0, which equals NRZ 1. The output power of

the code channels are allocated according to the frame length, channel coding and its rate, etc. In this example, Walsh code is used in fundamental channel.

During simulation, the Control Panel is displayed to allow noise magnitude adjustment. For EVM measurement, noise magnitude must remain constant before a Data collection is complete message is displayed.

Simulation Results

The following figure shows the ACPR and EVM performance spectrum. Noise magnitude equals 0.5. The graph is saved in RevSR3HPSK.dds; corresponding data is saved in RevSR3HPSK.ds.

ACPR and EVM Performance

The following table shows EVM values based on different noise values.

EVM Values

EVM Noise Magnitude Value

0.039 0 0.044 0.5 0.069 1 0.097 1.5

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CCDF Performance

Benchmark

Hardware platform: Pentium II 400 MHz, 256 MB memory Software platform: Windows NT 4.0 workstation, ADS 1.3 Data points: data of 2 msec

Simulation time: 630 seconds

Peak to Average Power Ratio of HPSK and QPSK Modulation Measurements

CDMA2K_Measurement_prj Design Name

DsnCDMA2K_H_Q_PSK_PAPR.dsn

Features

Reverse HPSK modulation Forward QPSK modulation Walsh modulator 48-order baseband filter

Peak to average power ratio (PAPR) measurement CCDF measurement

Description

is an example design to compare PAPR performance of HPSK and QPSK.

DsnCDMA2K_H_Q_PSK_PAPR.dsn

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1.

DsnCDMA2K_H_Q_PSK_PAPR.dsn

Notes

Channel coding and Rake receiver are not shown in this example.

Simulation Results

The following figure shows CCDF performance; the graph is saved in _H_Q_PSK_PAPR.dds_; corresponding data is saved in _H_Q_PSK_PAPR.ds._ According to the graph, for a probability of 0.01%, the PAPR of the HPSK signal is approximately 1.5dB lower than the signal with QPSK modulation.

(18)

CCDF Performance

Benchmark

Hardware platform: Pentium II 400 MHz, 256 MB memory Software platform: Windows NT 4.0 workstation, ADS 1.3 Data points: 64K

References

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